Species diversity of the marine diatom genus Skeletonema in Japanese brackish water areas

2013 ◽  
Vol 79 (6) ◽  
pp. 923-934 ◽  
Author(s):  
Machiko Yamada ◽  
Mayuko Otsubo ◽  
Yuki Tsutsumi ◽  
Chiaki Mizota ◽  
Naoki Iida ◽  
...  
Keyword(s):  
Species Diversity ◽  
Brackish Water ◽  
Marine Diatom ◽  
Diatom Genus

scholarly journals Species Composition Features of Zoopankton in Mineralized Water Bodies from Specially Protected Natural Territories in Ulug-Khem Basin (Republic of Tuva)

2021 ◽  
pp. 398-414
Author(s):  
A. К. Kirova
Keyword(s):  
Species Diversity ◽  
Species Composition ◽  
Brackish Water ◽  
Anthropogenic Impact ◽  
Water Bodies ◽  
Natural Objects ◽  
Mineralized Water ◽  
The Status ◽  
Favorable Conditions ◽  
Specially Protected Natural Territories

The species composition of zooplankton in mineralized water bodies located in the Ulug-Khem basin (Republic of Tuva) was studied. These lakes have the status of natural monuments of regional significance. In total we recorded 53 species of microscopic Custaceans and Rotifers from 32 genera, 13 families, and 8 orders. Cladocera comprises 53% of the species. The dependence of the species diversity on the level of mineralization was revealed; 89% of the species were found in brackish water bodies. The zooplankton composition of the hyperhaline lakes Dus-Khol (Svatikovo) and Cheder has remained constant for many dozen years. The zooplankton includes some species known only from Republic of Tuva in Russia, namely, Microcyclops afganicus and Macrotrix tabrizensis. M. asiaticus and Alona irinae, rare for the fauna of Russia, live in the lake Haak-Hol. A decrease in the total numbers of zooplankton is observed in the lakes, namely: in the lake Dus-Khol, it has decreased by 4 times, in the lake Khadyn it has decreased by 10–19 times as compared to the middle of the last century. Despite the lack of intermediate information, we regard this as a consequence of anthropogenic impact. The emergence of an indicator of pollution (Brachionus nilsoni) in the lake Khadin confirms this version. At the same time, the stable finding of species rare for the fauna of Russia indicates the presence of favorable conditions for their development and life, which increases the value of the reservoirs themselves, which are already unique natural objects.

Sabbea gen. nov., a new diatom genus (Bacillariophyta) from continental Antarctica

Phytotaxa ◽  
2019 ◽  
Vol 418 (1) ◽  
pp. 42-56 ◽  
Author(s):  
JORDAN BISHOP ◽  
KATEŘINA KOPALOVÁ ◽  
JOSHUA P. DARLING ◽  
NICHOLAS O. SCHULTE ◽  
TYLER J. KOHLER ◽  
...  
Keyword(s):  
New Genus ◽  
Morphological Characteristics ◽  
Sensu Stricto ◽  
Morphological Features ◽  
Marine Diatom ◽  
Continental Antarctica ◽  
Diatom Genus ◽  
Antarctic Continent ◽  
Vestfold Hills ◽  
The Antarctic

The non-marine diatom flora of the Antarctic Continent includes several endemic taxa recorded over the past 100 years. One of these taxa, Navicula adminensis D.Roberts & McMinn, was described from the Vestfold Hills, East Antarctica. Detailed light and scanning electron microscopy observations have shown that based on its morphological features, the species does not belong to the genus Navicula sensu stricto. To determine the most closely related genera to N. adminensis, the morphological features of Adlafia, Kobayasiella, Envekadea, Stenoneis, Berkeleya, Climaconeis, and Parlibellus were compared with those of N. adminensis. Although each of these genera shows one or more similar features, none of them accommodates the salient morphological characteristics of N. adminensis. Therefore, a new genus, Sabbea gen. nov., is herein described, and Navicula adminensis is formally transferred to the new genus as Sabbea adminensis comb. nov. The genus Sabbea is characterized by uniseriate striae composed of small, rounded areolae occluded externally by individual hymenes, a rather simple raphe structure with straight, short proximal ends and short terminal raphe fissures, open girdle bands with double perforation and a very shallow mantle.

Three new Eunotia (Bacillariophyta) species from Acadia National Park, Maine, USA

Phytotaxa ◽  
2014 ◽  
Vol 175 (4) ◽  
pp. 181
Author(s):  
Jana Veselá ◽  
Jeffrey R. Johansen
Keyword(s):  
New Species ◽  
Species Diversity ◽  
Geographical Distribution ◽  
National Park ◽  
Acadia National Park ◽  
Freshwater Ponds ◽  
Species Cluster ◽  
Diatom Genus ◽  
Three New Species ◽  
Group Species

Three new species in the diatom genus Eunotia were found in the freshwater ponds and streams of Acadia National Park, Maine, USA. Eunotia novaeangliae sp. nov. belongs to the E. incisa group, species with nose-like apices and terminal raphe fissures distant from the ends. It is most similar to E. tenelloides in that species cluster, although differs in the valve shape, geographical distribution, several ultrastructural details and slight but consistent differences in valve dimensions and striae density. Eunotia panda sp. nov. is in the E. bilunaris group, species with slight even curvature and smooth margins of the valves. However, E. panda can be distinguished from E. bilunaris by dorsally slightly recurved apices with rounded ends, ultrastructural details and noticeably constant valve width. Eunotia spatulata sp. nov. is most similar to E. eurycephala, but differs from that taxon by having straighter and significantly larger valves with more swollen apices. All three taxa were sufficiently abundant in the samples collected from the park that they could be found in both SEM and LM microscopes. Eunotia novaeangliae and E. panda have both been illustrated in other publications before but not named. All three species occurred in waters of low conductivity and pH, typical for the genus. Acadia National Park appears to be a hotspot for Eunotia species diversity, and further study of the oligotrophic waters of this site is certainly warranted.

The intriguing marine diatom genus Corethron in Late Cretaceous amber from Vendée (France)

2015 ◽  
Vol 52 ◽  
pp. 64-72 ◽  
Author(s):  
Simona Saint Martin ◽  
Jean-Paul Saint Martin ◽  
Alexander R. Schmidt ◽  
Vincent Girard ◽  
Didier Néraudeau ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Marine Diatom ◽  
Diatom Genus

What, if anything, is a brackish-water fauna?

1989 ◽  
Vol 80 (3-4) ◽  
pp. 235-240 ◽  
Author(s):  
R. S. K. Barnes
Keyword(s):  
Species Diversity ◽  
Brackish Water ◽  
Competing Species ◽  
Soft Sediments

ABSTRACTThe nature of the fauna of brackish-water environments is reviewed. It is concluded that: (a) a specific brackish-water macrofauna does not exist; (b) in salinities of >c. 5-8‰ the fauna is one that also occurs in soft sediments under fully marine conditions when circumstances (possibly the absence of competing species) permit; (c) in salinities of <c. 5‰ the fauna is essentially a freshwater one; and (d) inability to cope physiologically with brackish water is not a factor of major importance in limiting species diversity in these habitats, except in the vicinity of 5‰ salinity. Caution is therefore advised in assigning brackish status to past environments on the basis of their preserved fauna.

scholarly journals Specificity of Lipoxygenase Pathways Supports Species Delineation in the Marine Diatom Genus Pseudo-nitzschia

PLoS ONE ◽  
2013 ◽  
Vol 8 (8) ◽  
pp. e73281 ◽  
Author(s):  
Nadia Lamari ◽  
Maria Valeria Ruggiero ◽  
Giuliana d’Ippolito ◽  
Wiebe H. C. F. Kooistra ◽  
Angelo Fontana ◽  
...  
Keyword(s):  
Marine Diatom ◽  
Species Delineation ◽  
Diatom Genus

scholarly journals Brackish water Oscillatoriaceae from North 24-Parganas, West Bengal, India

1970 ◽  
Vol 15 (1) ◽  
pp. 31-38
Author(s):  
Nurmohammad Naskar ◽  
K.R. Naskar ◽  
C.R. Sen
Keyword(s):  
Species Diversity ◽  
Water Temperature ◽  
Brackish Water ◽  
West Bengal ◽  
Present Communication ◽  
Close Relationship ◽  
Plant Taxon ◽  
Salinity Levels ◽  
Brackish Water Species ◽  
Water Species

The present communication enumerates 40 taxa of Oscillatoriaceae from the brackish water wetlands of North 24-Parganas district of West Bengal. Out of the reported taxa, 12 are from each of Lyngbya and Oscillatoria, 6 from each of Phormidium and Spirulina, 2 belong to Schizothrix, and Hydrocoleum and Katagnymene are represented by one species each. A close relationship was observed between seasonal water temperature and salinity levels of the wetlands in enhancing algal population.Keywords: Brackish water, species diversity, ecosystem, Oscillatoriaceae, North 24-Parganas, West BengalDOI: 10.3329/bjpt.v15i1.909Bangladesh J. Plant Taxon. 15(1): 31-38, 2008 (June) 

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